From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 853F7389365C; Thu, 30 Apr 2020 19:32:50 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 853F7389365C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1588275170; bh=TJ3jbr2i8sAkDl9XJqIH3n4rxyV24gNGljJX2nkvFso=; h=From:To:Subject:Date:In-Reply-To:References:From; b=oPJwgyxxRlWC8UjMByjpjZU7RgYV9HtMw2mePCAzrfnUkj4wWVD8QcbWD6skHBnVd YsiZBD66V0m9WnINUU9Lt1ILOg/blvRHIPTZ2Y5YYf9zv2vF0r5MtF+r5sQn6KT45k r8SpsFq3KQs01zc98QpKFOei1AuiRVkC/elWbbow= From: "gabravier at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/94892] (x >> 31) + 1 not getting narrowed to compare Date: Thu, 30 Apr 2020 19:32:50 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 10.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: gabravier at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 Apr 2020 19:32:50 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94892 --- Comment #2 from Gabriel Ravier --- In that case, then, GCC is generating sub-optimal code for `(x >> 31) + 1` alone since it optimises that to the same thing as LLVM=